Owen is working two summer jobs, making $25 per hour tutoring and making $10
per hour clearing tables. In a given week, he can work no more than 12 total hours
and must earn a minimum of $150. Also, he must work a maximum of 9 hours
tutoring and a maximum of 4 hours clearing tables. If a represents the number of
hours tutoring and y represents the number of hours clearing tables, write and solve
a system of inequalities graphically and determine one possible solution.